SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '322c48904ee8351d4f39cba67e6756434725fa6cce058a1372104d16b112bd3e' 
  AND token = 'bKyQ4xpwYix5/Z2bktyfz+GZvvCjoUqUGJAocYzKhZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}